It has been announced that the whole Beckham clan - David and his wife, and the couple's three boys, Brooklyn, Romeo and Cruz – have joined forces to produce a range of T-shirts for this year's Sport Relief.

David, 34, used a self portrait demonstrating his famous football skills while his sons armed themselves with spray cans to make their mark on the charity clothing.

Not content with just designing, the big-hearted star is also due to appear in a TV sketch for Sport Relief weekend – beginning March 19 - getting a massage from Gavin and Stacey's Smithy played by James Corden.

Speaking about his family's unique collaboration, David said: "Victoria and I are excited to be involved with Sport Relief again this year.

"Our family had a great time designing the T-shirt range and we hope it will raise much needed funds for many important causes."

Posh and Becks are not the only famous faces joining in with the worthwhile cause. A number of celebs are taking on physical challenges to help raise money and awareness.

Christine Bleakley is swapping her stylish outfits for a wetsuit to attempt to water-ski across the Channel.

The 30-year-old – who confirmed her relationship with Chelsea player Frank Lampard this week – has been training in Ramsgate ahead of her attempt to reach France.

But it's still going to be a big challenge. "I have never skied before," confessed the brunette presenter.

"I have been out at sea and it was the most exhausting thing I have done. I'm not a great swimmer so it's utterly ludicrous. But if I do it I will never be more proud of myself."

Meanwhile Blue Peter's Helen Skelton will attempt to become the first woman to kayak along the Amazon, and rugby ace Laurence Dallaglio will cycle from Rome to all the Six Nations stadiums.

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